1 Answer
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VLC Media Player is able to do 1. and 2.. When you show the video/audio track in the playlist, right click on it and then click on "Information" (4th option from the top). A popup to edit the track datas (name, comment, album, artist...) will be displayed.

For 3., Clementine Media Player can do that for audio files. It gets search capabilities for this. It can also edit audio files (1. and 2.). For this, right click on an audio track, and then click on "Edit track information". You can also do this with the Ctrl + E keyboard shortcut. Clementine is also able to complete tags automatically with its tag fetcher. For this, right click on the track and then click on "Fetch tags" (or something like that). You can also use the Ctrl + T keyboard shortcut for this.